Stits Epoxy Primer Kits White Ep-420/Ep-430/E-500

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Quart Kit (Yields 2.5 Qts)Gallon Kit (Yields 2.5 Gal.)
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**Note: Quart Kit is pictured**

This white heavy duty chemical and solvent resistant amine cured primer from Stits is fast drying and corrosion inhibiting. It can be applied and cured to temperatures down to 35F. Mixing ratio is 2 parts base, 1 part catalyst.

Catalyst use: An amine resin in a solvent blend for use in EP-420 Epoxy Primer according to directions on the base component listing. Mixing ratio is 2 parts base, 1 part catalyst.

Reducer use: A blend of solvents for use in EP-420 Epoxy Primer according to the directions in the base component listing. Reduce 50%.

Stits Epoxy Primer Kit White includes EP-420 Epoxy Primer, EP-430 Epoxy Primer Catalyst, and E-500 Epoxy Reducer. Available in quart or gallon sized kits.

Important Notice: All mixed paints are special order and are non-returnable.
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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Reference Chart


Qt. Kit (Yields 2.5 qts) Incl. catalyst & reducer 09-00285
Gal. Kit (Ylds 2.5 Gal.) Incl. catalyst & reducer 09-00438
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Dale R Verified Purchase


March 4, 2023

As expected

Alain M Verified Purchase


January 7, 2023

Jonathan W Verified Purchase


November 22, 2022

Ive used EP 420 before on gear and flap well and it always holds up under fluids. Good product!

Flightec L Verified Purchase


February 25, 2022

I replenish this item every 6 mos or so and Aircraft Spruce service is terrific: always fast and efficient, so that I dont have to hold a perishable shelf life product in long term storage in my shop. I relay on Aircraft Spruce for a wide range of products and place orders 12 to 15 times a year for everything from avionics to hardware.

Tom M
July 13, 2020


May 16, 2020

Great service,and great product.

Berry S
December 7, 2019

Highly recommended. Using this to prime an aluminum airframe before fabric covering. Attended an EAA fabric covering workshop and this was recommended. Immersion treat in BONDERITE C-IC 33 AERO, then BONDERITE M-CR 1001 AERO, then this primer. This does a fantastic job and the metal is good to go for the life of the plane.

October 4, 2019

Doesnt go on well with a brush until about the second to third coat on aluminum, but covers very well with multiple coats. Very hard smooth finish when it dries.

September 28, 2017

Have always used this product on fabric covering after the silver. The white makes certain colors as in reds and yellows more vibrant. Excellent choice for aluminum also before final paint.

Aerodynamic C
April 13, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: How many square feet will the quart kit of Stits Epoxy Primer cover? Im painting an aluminum wing (two coats).

Per the Poly Fiber how to manual, one gallon of catalyzed, and reduced, material will cover 1000 sq ft, one coat.

Q: What is the shelf life on this Stits Epoxy Primer?

The primer, part A, has a 4 year shelf life, and the catalyst, part B, has a 2 year shelf life, per the Poly Fiber How To Manual.

Q: Can this Stits epoxy primer be used on fiberglass surface before painting over with polyfiber enamel?

Yes, that will work.

Q: Can the Stits epoxy primer be ordered with one of the Poly Fiber colors instead of white?

No it can only be ordered in white or green.

Q: Will cold shipping conditions effect this product? its -9 here today

Per the vendor, these are solvent based so the temp should not effect the product.

Q: Can this be applied on Vinyl Ester Fiberglass Laminate?

Per the Poly-Fiber manual, this is for metal surfaces.

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